hybrid switch

Abstract

A hybrid switch, in particular, a hybrid switch suitable for being used in an alternating current power grid, comprising a mechanical switch, a thyristor, a first current limiting element, a unidirectional conduction device, a capacitor, a semiconductor switch, a voltage stabilizing device and a control unit. Two ends of a circuit of the mechanical switch are respectively connected to a first end of the thyristor and a third end of the thyristor; the control unit is connected to a control end of the mechanical switch and a control end of the semiconductor switch; the first current limiting element, the unidirectional conduction device and the capacitor are connected in series to form a series circuit, wherein one end of the series circuit is connected to the first end of the thyristor, and the other end of the series circuit is connected to another phase line or a neutral line with respect to the first end of the thyristor; the capacitor forms a discharge circuit through the semiconductor switch, a second end of the thyristor and the first end of the thyristor; and the voltage stabilizing device is connected in parallel with the capacitor.

Description

technical field [0001] The hybrid switch of the invention belongs to the electrical field, in particular to a hybrid switch suitable for application in an AC power grid. Background technique [0002] At present, in the AC power grid, hybrid switches are more and more widely used, such as composite switches (thyristors and mechanical switches are operated in parallel), which use transformer isolation drive or high-voltage electronic switches to drive thyristors, which have the following disadvantages: [0003] 1. Transformer isolation drive: The trigger signal of the thyristor is provided by the transformer, which requires a pulse signal generation circuit, a transformer drive circuit, a transformer, and a rectifier circuit. It can cause the disadvantages of the thyristor on the mechanical opening and breaking arc extinguishing effect, low cost performance, and large space occupation. [0004] 2. High-voltage electronic switch drive: The trigger signal of the thyristor is se...

AI Technical Summary

Problems solved by technology

[0003] 1. Transformer isolation drive: The trigger signal of the thyristor is provided by the transformer, which requires a pulse signal generation circuit, a transformer drive circuit, a transformer, and a rectifier circuit. It can cause the thyristor to mechanically open and break the arc extinguishing effect, low cost performance, and large space occupation.

[0004] 2. High-voltage electronic switch drive: The trigger signal of the thyristor is sent from the main circuit of the thyristor through a resistor, a high-voltage electronic switch (full-controlled or half-controlled switch, such as a high-voltage optocoupler such as MOC3083) to the trigger pole of the thyristor, and the high-voltage electronic switch withstands relatively high voltage. High voltage, and most of the working conditions need to be used in series, which has the disadvantages of poor reliability, easy breakdown, false conduction, and large conduction inrush current

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